Eagnae cablstedt



May 30, 1933. R. CARLSTEDT HYDRAULI C REGULATOR Filed Oct. 4, 1930 Patented May 30, 1933 "UNITED-STATES RAGNAR GARLSTEDT, 0F STOCKHOLM, SWEDEN nvnimumc Application filed October 4,1930, Serial No.

The present invention refers tohydraulic regulators operating with a non-compressible regulating liquid, such as water, oil or the like, whereinthe throttled pressure liquid actuates a plunger, diaphragm or the like forming part of a servo-motor, and continues through a discharge port or opening con trolled by an impeding or throttling member actuated by that which is to be regulated through the agency of an impulse receiving member. I

More particularly, the invention relates to the throttling member. with its appurtenant parts, and has for its object, first, to bring about favorable discharge conditions for the pressure liquid and thus a sensitive regulation by a suitable formation of said member and, second, to construct the said member in a manner suited for-standardization, with facilities for simple removal or.

exchange.

In accordance with the invention, the

throttling member preferably consists of a weight freely suspended from the impulse receiving member. The throttling member may advantageously include a needle or stem and, on the side directed toward the discharge port or opening, be bowl-shaped to cause a 7 suitable deflection of the dischargedliquidu That portion of the-valve body which cooperates directly with the discharge opening and which also extends into the same in the given a concave or convex profile, depending on the desired discharge COIlClltlOIlS for a predetermined movement of the throttling member. The throttling member which is.

in the said opening, which latter may be. covered by a cap-like formation at the upperend of the throttlingmember, so thatdust and other contaminationsare prevented from The accompanying drawing illustrates a few embodiments of adevice according to the invention. -Fig.' .1 shows by way of dia- 1 rigid frame 15. closed position may bemade conical or be nneunn'ron 486,386, and in Glermany'November 8, 1929. I

grammatic representation an. embodiment for steam-regulation, in longitudinal section. Fig. 2'shows the valve member on a larger scale. Figs. 3and 4show two further embod'iments of the valve member. 5 With' reference to Fig. 1, the: servo motor cylinder is designated by 1,. while the working piston is denoted by' 2 and the" piston rod by 3. The liquid supply to the, cylinder 1 takes place through a channel l'provided 6 with a throttle passage 5 in which is arranged a movable cleansing needle6 to prevent choking of the throttlepassage. The

channel 1 opens into the cylinder at a point sltuated on the side of the workingpiston 2 opposite tothat of the piston rod 3.

.Rotatably arranged at the free end of the piston rod is a cord pulley 7 having a cord 8 running thereover, the one end of which is secured to the bottom of the cylinder, while the other end: of the cord cooperates with the main control memberto be regulateds'uch as a steam valve 9, as shown in thedrawing.

. At the upper end of the cylinder 1 of the servo motor is arranged a valve chamber 10 communicating with the cylinder space through a discharge port .12 controlled by throttling member 11, said valve chamberbeing provided with a discharge port or opening 13 for the pressure liquid. The valve casing 14; with the cylinder 1 is arranged on a The impulse device is provided at the upper end of this frame and consists of a chamber 16 in which are arranged bellows 17 actuating a bell crank lever 21 by means of a rod lsprovided with aknife edge, against the action of a spring 19, said bell crank lever being pivotally'fixed to a projection 20 of the frame 15. The tension of the spring 19 is controlled-by means of a set screw 22. The chamber 16 containing the bellows 17 communicates through a pipe 23 with the steam conduit 2 1 controlled by the valve 9.

Secured'to the free end of the bell crank lever 21 is a flexible non-elastic chain 25 or the like which is longitudinally non-resilient and thereof.

This throttling member 11, which is made in the form of a Weight, extends with acertain play through a corresponding opening 26 at the top side of the valve casing 14 and into the port 12 in the cylinder cover, which opening is to be regulated. The valve body 11 is bowl-shaped on the lower side, in order to suitably deflect the liquid discharged through the opening 12. According to Figs.-1 and 2, a conical regulating body 27 is provided from which a stem or needle-shaped projection 28 extends. a

As will be seen from Figs. 3 and 4, the said regulating body 27 may be made with a concave or convex profile, in accordance with the desired discharge conditions for the liquid passing through the port 12, that is to say, in

accordance with various enlargements of the area of passage, as desired, at a certain lift of the valve body 11.

Arranged at the opening 26 in the valve casing 14 is an annular flange 2 9 surrounded by a cover 30 provided on the upper end ofthe valve body 11, so that penetration of contaminations into the casing 14 is prevented.

By the construction of the regulator above described it will thus always be possible to remove and to apply the throttling member 11 in a simple manner, without the necessity of loosening any screw joints or the like for this purpose, the throttling member having [only to be. lifted out of or to'be introduced into the opening 26 in the valve casing, selfguidance into the proper position being then obtained'through the agency of the regulating body 27 Moreover, the movements of description here.

the impeding member take place practically without friction in operation, and the valve chamber 10 with the port: 12 is rendered easily I accessible, for instancefor cleaning purposes.

The mode of operation of the device is previously known per .se and requires no further On variations of the condition which is to be kept constant by means i of a device of the type in question, for instance of the condition-of the steam in the steam conduit 24, the pressure in the chamber 16 is altered and thus the position of the regulating lever 21 is also altered through the bellows 17 and the rod 18, so that a greater or smaller quantity of pressure liquid is discharged through the port 12 and corresponding pressure variations are thus produced in the servo-motorwhich, in turn, actuates the steam valve 9 in a corresponding degree.

Although the invention has been shown with a chain connection between the impulse "receiving member and the throttllng member, it will be apparent that various types offlexible or non-rigid connections may be used without departing from the spirit of the invention, and it is tobe understood that I do not limit myself to any specific structure except as defined by the appended claims.

What I claim is 1. Regulating apparatus comprising an impulse receiving member movable in response to variations in the medium to be controlled, a main control member, pressure liquid actuated means for operating said main control member including a. housing having a discharge port for outflow of liquid, a

throttling member having appreciable mass,

control member including a housing having a discharge port for outflow of liquid, a relatively wide cylindrical throttling member of appreciable mass, and a non-elastic flexible member connected to and between said impulse receiving member and said throttling member and freelyLsuspending said throttlingjmember immediately over said port,

movement of saidimpulse receiving'member being transmitted throughsaid flexible member,land said throttling member including a stem projecting downwardly into' said port.

3. Regulating apparatus comprising an impulse receiving member movable in response to variations in the medium to be controlled, a main control member, pressure liquid actuated means for operating said main control member includinga housing having a discharge port for outflow of liquid,

a relatively wide cylindrical throttling member of appreciable mass, and.a non-elastic flexible member connected to and between said impulse receiving member. and said throttling member and freely suspending said gthrottling member immediately over said port, movement of said impulse receiving member being transmitted. through said flexible member, said throttling member having a lower rounded projection, a stem'extending from said projection into said port, and an annular smooth surfaced deflecting groove around said projection.

4. In a regulator, the combination with of fluid pressure, a servo-motor for operating said valve and comprising a'cylinder having one end closed toprovlde a fluid pressure chamber, ad1scharge port located in said closed end of-thecylinder, a piston reciprocable in said cylinder and adapted to actuate said valve, an inlet port'for fluid pressure fromsaid'source located near a conduit, a valve in said conduit, a sourcetpi the closed'end of said cylinder, an impulse member comprising a casing, a bellows ar-" ranged in said casing and responsive to the pressure in said conduit, a bell crank lever operated by said bellows, a throttling member consisting of a cylindrical mass having 5 a reduced end and adapted to vary the flow through said discharge port, and means for I suspending said throttling member from said bell crank lever.

5. In a regulator, a throttling member comprising a solid cylindrical mass having an annular groove in one end, a rounded projection extending from the central part of said cylindrical mass, the surface of said groove and said projection being continuous, a stem projecting from the center of said projection, liquid containing means having a discharge port for directing a stream of liquid toward said throttling member, said groove serving to deflect liquid discharged through said port, said throttling member being arranged to vary the pressure of said liquid, said stem being positioned in said discharge port, means responsive to an impulse transmitting agent for determining the position of said throttling member, and control mechanism actuated by variations in the pressure of said stream.

6. Regulating apparatus comprising an impulse receiving member movable in reponse to variations in the medium to be controlled, a main control member, pressure liquid actuating means for operating said main control member including a housing having a discharge port for outflow of liquid, a throttling member having appreciable mass, and a movement transmitting member connected to and between said impulse receiving member and said throttling member and freely suspending said throttling member over said port, said movement transmitting member being longitudinally non-resilient and laterally swingable permitting said throttling member to have free lateral movement with respect to its suspension and to the discharge port.

7. Regulating apparatus comprising an impulse receiving member movable in response to variations in the medium to be controlled, a main control member, pressure liquid actuating means for operating said main control member including a housing a discharge port for outflow of liquid, a throttling member having appreciable mass, and a movement transmitting member connected to and between said impulse receiving member and said throttling member and freely suspending said throttling member over said port, said movement transmitting member being longitudinally non-resilient and laterally swingable permitting said throttling member to have free lateral movement with respect to its suspension and to be centered by the outflow of liquid from the be centered by the outflow of liquid from discharge port and being longitudinally col lapsible.

In testimony whereof, I have hereunto affixed my signature. I RAGNAR CARLSTEDT. 

